Blender and 3ds Max

Maya

Export an FBX file and then convert it to glTF. Your PBR settings will be preserved. The FBX2glTF converstion program will automatically swizzle your packed textures properly.

Modo

As of Modo 11.2v3, you can author and export GLB files directly using the glTF materials and export options. This is the most direct way to author GLB files, and you can author using full PBR along with vertex color.

To export from Modo directly, use the glTF material, set your viewport to Advanced, then assign textures and tune your materials.

Occlusion, Roughness and Metalness are packed into the ORM texture, so you have to swizzle them to see them properly.

Transparency is driven by the alpha channel of your Base Texture. In Modo 11.2v3, make a duplicate of your Base Texture, set its effect to transparent amount, and swizzle the alpha channel into it.

Use “Export As” to write out a GLB file that includes all of your textures (glTF leaves the textures loose).

Please note that 3D Posts display in gamma 2.2. Modo's “Vertex Map” and “Texture” display settings are in linear gamma, so vertex colors that look good in Modo will appear washed out in Facebook Posts.

Paint 3D

Microsoft's Paint 3D now allows you to export GLBs:

Substance Painter

You can directly export a GLB out of Substance Painter and then drag it into a new post. Keep your textures as small as you can, ideally under 2k, but no more than 4k.

To export from Substance Painter, go to Export Textures...

... and choose the glTF PBR Metal Roughness option. It will export the textures, a GLB and a glTF file into your export folder.

GLBs for 3D Posts must be under 3MB. The easiest way to do this is to use JPEG textures instead of PNGs. Unfortunately, Substance Painter doesn't support this, so use our GLB Packer to convert your glTF to a GLB that uses JPEGs instead of PNGs. The packer will automatically convert your textures to JPEGs and create a new GLB for you.

Sketchfab

You can upload most 3D formats to Sketchfab, tweak stuff, then export a glTF. Once you have a glTF, you can easily convert it to a GLB using using our GLB Packer.